Controllable Grid Interface

Engineers have developed a cross-cutting approach to testing grid integration using the Controllable Grid Interface (CGI) that provides grid operators with the performance information they need for a fraction of the time and cost it would take to test a turbine in the field.

NREL's 7-megavolt amperes CGI test system can reduce certification testing time and costs while providing system engineers with a better understanding of how wind turbines, photovoltaic inverters, and energy storage systems react to disturbances on the electric power system.

The first test facility in the United States that has fault simulation capabilities

Allows manufacturers and system operators to conduct certification tests in a controlled environment

Fully integrated with two dynamometers, turbines in the field, and to a matrix of electronic and mechanical storage devices

Tests wind turbines offline from the grid

Verifies compliance with standards

Previously recorded data from various power systems or from data generated by models allows for accurately-produced inertial and primary frequency response controls testing and validation

Testing Capabilities

Engineers at the NWTC have the ability to connect the CGI to a number of test facilities, including the 5- and 2.5-MW dynamometers, grid integration research test pads, individual or multiple MW field-research wind turbines, and the Energy Systems Integration Facility. These connections allow for the following capabilities: